I have an inventory system running in a retail outlet where all items and its EAN 13 codes are stored in the DB. SO when an item barcode is scanned curresponding item details are shown in the screen.
But the Grocery items does not have EAN codes. but when a grocery is weighed using the weighing scale it generates a Barcode in 13 digit EAN format. and it will contain the itemcode,weight, rate etc.. in the barcode itself. ie each time it may have different barcodes generated for the same item. Now i need to identify if the item is a real EAN 13 code or generated from the weighing scale. so that i can interpret the item details correctly.
Could anyone help me to idenntify the general practice followed for this? I could not find any info by searching google

Thanks